how to add a pop up page or mesage to my home page

What kind of pop-up – a new window, or a lightbox overlay, or a little alert box, or something else entirely?

like a image or latest updates or ads

You might want to take into consideration the following:

• Pop-up blockers
• Suitability
• Acceptability

Many web surfers have popup blockers installed because they don’t want popups. Some popups may not be suitable in every instance for the audience. Finally, some users may not accept popups in their content.

It’s a trade-off that merits some looking into.

Regards,
Scott

srry i dont need a pop out window or like tht…..i need a message to be displayed when my site is opened

??

I do a lot of coding by hand. It might be easier to Google and see an example of what you want and then edit your theme file to include the code in the header.